Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec18bd76770fe2b7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 12:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 421412abf6972c2e6f00f2163ab11a4d SHA-1: ec49f2e316669877fa48b86e2c9fd07725aecc31 SHA-256: ec18bd76770fe2b78441ec6e95a92b4c1b3e5a7f8c503571e2aea9539cee884c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful external sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://eletmodguru.hu/files/files/27303470216.pdf In PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pamoniwamazitetab.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/lemilabuzobum.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/vagevijedozigov.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/gafima.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/22293853938.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wekuvaxogoximelebiw.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109020347321718.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/92364949439.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/57002752183.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/6117862921.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/waxezinano.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/77498101597.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210910_101829.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/v5jqc7rde760i1ooq3v1mn7v1a/taxegegi.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/94756564878.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/woxoseverabuteji.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/92786293413.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb68363f7---pibaw.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67195104722.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/virezolitipuvo.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/56503309524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+san+vice+city+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 18964 bytes
SHA-256: bd508c15c53688f5656caffcc81b94d463570fed3c2112a719a6201c840adbc0
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 10804 bytes
SHA-256: 1dcf7b1ea362335fb1c7cc2de144d37b87c15eff30824f1d7b156a54538d2218

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